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A brief description of the calculation of the life of deep groove ball bearings:
Usually, the calculation steps of deep groove ball bearing life are:
1. According to the technical parameters of the main engine and the structure of the supporting part, the type and size of the bearing are initially selected, and the load acting on the bearing is calculated;
2. Calculate the equivalent dynamic load;
3. Calculate the bearing life according to the bearing rated life formula;
4. Check the rated static load and limit speed.
The rated life of rolling bearings refers to the number of operations (in terms of 106 revolutions) or the number of working hours at a certain speed that 90% of the bearings in a batch of bearings can reach or exceed before fatigue spalling.
Basic rating life for deep groove ball bearings:
L10=(Cr/Pr)3 (million revolutions)
In actual calculation, the working hours are generally used to represent the life of the bearing (hours), which is:
Lh=(Cr/Pr)3/(60n)*106 (hour)
Among them, Cr: is the radial basic rated dynamic load (KN), which refers to the constant radial load that a set of rolling bearings can withstand. The basic rated life under this load is one million revolutions.
Pr: radial equivalent dynamic load (KN), which refers to the radial equivalent variable load of various external loads that the bearing is actually subjected to.
Basic rating life for roller bearings:
L10=(Cr/Pr)10/3 (million revolutions)
The life of the bearing (hours) is represented by the number of working hours: as:
Lh=(Cr/Pr)10/3/(60n)*106 (hour)
The calculation method of rated life is determined according to ordinary bearing steel and general working conditions, and the life reliability is 90%. Considering the influence of materials and service conditions and the requirement of high reliability, the International Organization for Standardization has revised the rated life formula by adding reliability coefficient, material coefficient and service condition coefficient.
At present, the actual service life of foreign advanced ball bearings is more than ten times the calculated life, and the reliability is more than 95%. The service life of the ball bearings produced by our factory can reach the domestic advanced level.
Dimensions and specifications of deep groove ball bearings:
Miniature bearings ---- bearings with a nominal outer diameter size range of 26mm or less.
Small bearings - bearings with a nominal outer diameter ranging from 28 to 55 mm.
Small and medium-sized bearings - bearings with a nominal outer diameter ranging from 60-115mm.
Medium and large bearings - bearings with a nominal outer diameter ranging from 120-190mm.
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